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Finding the Fourth Proportional to 1,447.76, 2,169.72 and 870.80

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Solution

The fourth proportional to 1,447.76, 2,169.72 and 870.80 is: 1,305.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.76 : 2,169.72 = 870.80 : x
  2. Step 2: Convert to fraction form
    1,447.76/2,169.72 = 870.80/x
  3. Step 3: Cross multiply
    1,447.76x = 2,169.72 × 870.80
  4. Step 4: Simplify right side
    1,447.76x = 1,889,392.18
  5. Step 5: Solve for x
    x = 1,889,392.18/1,447.76
  6. Step 6: Final answer
    x = 1,305.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.